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Effect of SES on quantity and quality of parent input at 14–18 mo. (A) SES of family predicts average words per minute uttered by the child’s parent during two 90-min recording sessions at 14 and 18 mo. (B) SES of family does not predict quality of parent input at 14 and 18 mo (accuracy measure calculated from HSP). Each point represents a single family (n = 50).
